Nemeses plague the squad, as Jake and Amy's big day gets derailed by the Vulture, and Charles must find his missing equine foe, Sgt. Peanut Butter.

Jake and Charles investigate a case of Hitchcock and Scully's from the 1980s. Meanwhile, Amy's uniformed officers and Terry's detectives fight over limited resources.

Jake investigates a series of car thefts that point to an old frenemy. Meanwhile, the squad defends their favorite bar from interlopers.

Jake finds his authority tested and thunder stolen by a beat-walking Holt amid a manhunt. Amy turns to Rosa for support during a personal crisis.

Amy returns from maternity leave. Jake and Rosa work a difficult case.